Add github workflow to benchmark incoming change against master

.github/workflows/benchstat.yml

@@ -0,0 +1,86 @@
+# This workflow runs benchmarks against the current branch, compares them to benchmarks against
+# master, and uploads the results as an artifact.
+
+# TODO: This workflow could be improved by only running on pull requests and then posting the results back
+# as a comment in the pull request.
+
+name: Benchstat
+
+on: [push, pull_request]
+
+jobs:
+  incoming:
+    runs-on: ubuntu-latest
+    services:
+      redis:
+        image: redis
+        ports:
+          - 6379:637
+    steps:
+      - name: Install Go
+        uses: actions/setup-go@v2
+        with:
+          go-version: 1.15.x
+      - name: Checkout
+        uses: actions/checkout@v2
+      - name: Benchmark
+        run: |
+          for i in {1..5}; do
+            go test -run=^$ -bench=. ./... | tee -a bench.txt
+          done
+      - name: Upload Benchmark
+        uses: actions/upload-artifact@v2
+        with:
+          name: bench-incoming
+          path: bench.txt
+  current:
+    runs-on: ubuntu-latest
+    services:
+      redis:
+        image: redis
+        ports:
+          - 6379:637
+    steps:
+      - name: Install Go
+        uses: actions/setup-go@v2
+        with:
+          go-version: 1.15.x
+      - name: Checkout
+        uses: actions/checkout@v2
+        with:
+          ref: master
+      - name: Benchmark
+        run: |
+          for i in {1..5}; do
+            go test -run=^$ -bench=. ./... | tee -a bench.txt
+          done
+      - name: Upload Benchmark
+        uses: actions/upload-artifact@v2
+        with:
+          name: bench-current
+          path: bench.txt
+  benchstat:
+    needs: [incoming, current]
+    runs-on: ubuntu-latest
+    steps:
+      - name: Install Go
+        uses: actions/setup-go@v2
+        with:
+          go-version: 1.15.x
+      - name: Install benchstat
+        run: go get -u golang.org/x/perf/cmd/benchstat
+      - name: Download Incoming
+        uses: actions/download-artifact@v2
+        with:
+          name: bench-incoming
+      - name: Download Current
+        uses: actions/download-artifact@v2
+        with:
+          name: bench-current
+      - name: Benchstat Results
+        run: benchstat bench-current/bench.txt bench-incoming/bench.txt | tee -a benchstat.txt
+      - name: Upload benchstat results
+        uses: actions/upload-artifact@v2
+        with:
+          name: benchstat
+          path: benchstat.txt

.github/workflows/go.yml

@@ -28,3 +28,6 @@ jobs:
 
     - name: Test
       run: go test -race -v ./...
+
+    - name: Bench Test
+      run: go test -run=^$ -bench=. -loglevel=debug ./...